Drilling tool



March 16 1926. 1,576,794

W. SASSE DRILLING TOOL Filed Jfily '7, 1925 {"1 6: a pi I i v i 1 l 1 Pmvemoe Patented Mar. 16, 1926.

UNITED STATES WILHELM SASSE, 0F SPANDAU, GERMANY.

DRILLING: IIOOL.

Application filed m '7,

To all whom it may concern:

Be it known that I, VVILHELM SASSE, a citizen of the German realm,residing at Spandau, Germany, have invented certain new and usefulImprovements in Drilling Tools, of which the following is a specification.

This invention relates to drilling tools and more particularly to toolsof this kind having a disc-shaped drilling cutter and a tool holderwhich effects the rotation of the former, said holder serving forfastening tli'e drilling tool to the spindle of a boring machine.

, Constructions are known, whereby milling cutters for the purpose ofmaking a depression are fastened to and at the same time centrallyadjusted with the holder, which is inserted into the spindle of thedrilling machine, said fastening and adjusting of the milling cutterbeing accomplished by means of an anchoring bolt introduced into .anaxial bore of said holder.

According to this invention there is also used an anchoring bolt of thekind mentioned, the novel bolt, however, having the particular effectthat it will not only serve as a connection between the holder and thedrilling cutter, but also as a carrier for de-- tachably holding theadvance cutter or guidin ivot, which is arranged in .front of the.drilling cutter proper. In addition to this the anchoring bolt accordingto this inventon is constructed to serve as a means for securing theadvance cutter in a definite position relatively to the drillingcutter-against independent rotation, for the purpose of providing a pathbetween the interstices of the drilling cutter, through which the out;

tings may be carried ofii. e In the drawing an example of the drillingtool according to this invention is represented, Fi 1 showing the tooland its connection with the tool holder and the advance cutter in alatertal view, Fig. 2 showing the tool as represented in Fig. 1 in alateral view perpendicular to that of Fig. 1, Fig. 3 being a plan viewof the advance cutter, Fig. 4 a bottom view of the drillingcuttertogether with the guiding pivot of the advance cutter engaging adepression, said pivot being shown in shaded lines, and Fi 5 atop viewof thedrilling cutter.

is shown in particular in Fig. 2 the holder a,'which'is intended to befastened to the spindle of the drilling machine, is provided enlargedpart of the axial bore of t .in this casemust alsobe provided with a1925. SerialNo. 41,953.

with an axial bore 6, said here serving for the reception of theanchoring bolt d, which is provided at its under end with a threadedpivot c. In proximity to the upper end of the anchoring bolt d there isprovided a transverse slot passing through said bolt,. said slot servingfor the reception of a flat key or arbor e. The key e passes through atransverse slot a which is provided at a proper height in the holder aand rests with its outwardly projecting ends upon a disc or washer 7,which as shown especially in Fig. 1 is provided with radially directedgrooves f0r"this purpose. The washer f is carried by an annular nut gwhich may be screwed upon a threaded part of the holder (1.

The anchoring bolt (1' isequipped at its lower end immediately in frontof the threaded ivot 0 with a collar h, which at its upper en exactlyfits into a correspondingly v e holder. At the same time said collar hengages with its lower part, which projects from the bore of the holder,a bore of exactly the same diameter provided in the drilling cutter 2' ifor centrally ad'usting the latter with respect to the tool older. a

The two driving pins 70 pass through the upper part of the tool holderand at their lower ends project into corresponding holes l in thedrilling cutter 2', whereby the latter will be secured againstindependent rotation.

In the example of the drilling tool, as represented in the drawing, thecentral bore 112. of the drilling cutter is of oval crosssectionalconfiguration in order to receive,

the oval guiding pivot n of the advance cutter and to secure the latterin such a position against unintended rotation, that the cuttingsproduced from the hole, which is being drille 'by the advance cutter,will be enabled to pass through the free spaces of the drilling cutter im upward direction. .Instead of the oval cross-sectional confi ration ofthe central bore m and the guiding pivot-n other non-circularcross-sections may also be employed. I

In case of drilling cutters of especially large diameters it-will be.necessary to replace the drill by a guiding pivot, which is made to fita smaller hole to be drilled by an especial drilling tool. This guidingpivot non-circular holding pivot-exactly the same as the advance cuttero and carry a threaded ins bore which is required for the reception ofthe threaded pivot c of the anchoring bolt d.

p If it is desired'to employ the drilling cutter 71 together with anadvance cutter 0, the drilling cutter 2' is first mounted upon theholding pivot n of the advance cutter o, thereupon the pivot n isscrewed upon the threaded pivot c of the anchoring bolt d. Thereupon theanchoring bolt is inserted into the axial bore of the holder andprotected a ainst falling off by the transverse key 6. y now unscrewingthe nut g in upward direction the advance cutter 0 and the drillingcutter 2' are, by means of the anchoring bolt d, drawn tight againsteach other as well as against the under end of the holder, so that arigid unit will be obtained, of which the several parts may i be veryquickly assembled, separated or exchanged with others.

I claim:

1. A drilling tool comprising disc-shaped drilling cutter, a holder forsaid drilling cutter, an anchoring bolt inserted into an axial bore ofsaid holder and having a collar for detachably securing said-drillingcutter to said holder in a centralposition therein, a

key and a nut provided on said anchoring bolt for fastening the latterto said holder, an advance cutter fastened to saidanchoring bolt, saidadvance cutter being of noncircular cross-sectional configuration andengaging a similar bore in said drilling cutter.

2. A drilling tool comprising a discshaped drilling cutter, a holder forsaid drilling cutter, an anchoring bolt inserted into an axial bore ofsaid holder and having a collar for detachably securing said drillingcutter to said holder in a central position therein, a key and a nutprovided on said anchoring bolt for fastening the latter to said holder,a threaded pivot on said anchoring bolt, an advance cutter engaging saidthreaded pivot, said advance cutter being provided with a non-circularpivot, and a bore in said drilling cutter, said bore be ing adapted forengagement with said noncircular pivot.

In testimony whereof I aflix my signature.

WILHELM SASSE.

